七年级数学上册第二章有理数2.13有理数的混合运算(2)课件(新版)华东师大版.ppt

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2.13 有理数的混合运算(2),数学运用,例1:计算,解:,数学运用,例2:计算,解:原式=,=,数学运用,例3:计算,解:原式,法1:,数学运用,例3:计算,法2:,原式,学以致用,1.计算,(1),(2),(3),30,0,-8,学以致用,2.下列计算是否正确?,(1),(2),(3),错,错,错,(4),错,回顾反思,如何进行有理数的混合运算按照有理数混合运算的正确顺序进行:先算乘方,再算乘除,最后算加减;有括号,先算括号里面的数合理利用有理数运算的法则和运算率,简化计算,谢谢观看!,

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